Sahih al-Bukhari 4123
صحيح البخاري#4123Sahihحَدَّثَنَا الْحَجَّاجُ بْنُ مِنْهَالٍ، أَخْبَرَنَا شُعْبَةُ، قَالَ أَخْبَرَنِي عَدِيٌّ، أَنَّهُ سَمِعَ الْبَرَاءَ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لِحَسَّانَ " اهْجُهُمْ ـ أَوْ هَاجِهِمْ ـ وَجِبْرِيلُ مَعَكَ ".
Narrated Al-Bara:The Prophet (ﷺ) said to Hassan, "Abuse them (with your poems), and Gabriel is with you (i.e, supports you)." (Through another group of sub narrators) Al-Bara bin Azib said, "On the day of Quraiza's (besiege), Allah's Messenger (ﷺ) said to Hassan bin Thabit, 'Abuse them (with your poems), and Gabriel is with you (i.e. supports you)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 64:167